There seems to be another problem. I am getting a lot of bounced emails when activating a new member through Admin Activate Email. I have taken this up with my ISP and this is what he says...
The 450 error is a report from my mail servers telling you that the destination server has refused to accept the message, but the reply back from them (4.7.1) points me back to the mybb forum script.
Although I’m not a PHP programmer I would be inclined to say that the issue is with the PHP mail class as it does not require outgoing mail settings and some service providers use reverse dns lookups on incoming mail to prevent spam – therefore the host ip address of messages sent by the PHP mail class would resolve to the ip address of the server running the website and not a qualified mail server.
Is there any way around this. It mainly happens when I am on holiday in Spain and not at home in the UK. Could that be why the servers are rejecting the mail ?